Buttocks acne can be caused by folliculitis, ringworm and other diseases. 1. Folliculitis: due to the buttocks long-term sweating stimulation, underwear friction, skin trauma and other reasons, can lead to buttock hair follicles by bacterial infection and follicular inflammation, can appear pimple-like changes, accompanied by pain and itching and other symptoms, manifested as buttocks long acne. 2. Ringworm: ringworm can occur after the buttocks are infected with dermatophytes, and the lesions are initially red papules, papules or small blisters, followed by the formation of scaly red patches, with clear borders and accompanied by itching and other uncomfortable symptoms. The initial lesion pattern of tinea cruris can resemble pimples. When the buttocks long acne, should be timely medical treatment, under the guidance of specialists actively line appropriate treatment, will help the early cure of the disease.